Sometimes when the weather is cooler like last December (rain whole month), some mushrooms grow in my plant containers. They can just pop out overnight! I have not seen the mushrooms in the second/last picture before... so cute.

I have no idea what kind of mushroom they are, but I think the ones in the bottom picture are green spored Lepiota. This is actually the most common mushroom people poison themselves by eating because in their earlier stage they can look a lot like Shaggy Maines which are another common lawn mushroom, and great to eat.